/*
 * FreeRTOS V202212.00
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * https://www.FreeRTOS.org
 * https://github.com/FreeRTOS
 *
 */
#include "FreeRTOS.h"
#include "semphr.h"

#define isrCLEAR_EINT_1    2

/*
 * Interrupt routine that simply wakes vButtonHandlerTask on each interrupt
 * generated by a push of the built in button.  The wrapper takes care of
 * the ISR entry.  This then calls the actual handler function to perform
 * the work.  This work should not be done in the wrapper itself unless
 * you are absolutely sure that no stack space is used.
 */
void vButtonISRWrapper( void ) __attribute__( ( naked ) );
void vButtonHandler( void ) __attribute__( ( noinline ) );

void vButtonHandler( void )
{
    extern SemaphoreHandle_t xButtonSemaphore;
    portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

    xSemaphoreGiveFromISR( xButtonSemaphore, &xHigherPriorityTaskWoken );

    if( xHigherPriorityTaskWoken )
    {
        /* We have woken a task.  Calling "yield from ISR" here will ensure
         * the interrupt returns to the woken task if it has a priority higher
         * than the interrupted task. */
        portYIELD_FROM_ISR();
    }

    EXTINT = isrCLEAR_EINT_1;
    VICVectAddr = 0;
}
/*-----------------------------------------------------------*/

void vButtonISRWrapper( void )
{
    /* Save the context of the interrupted task. */
    portSAVE_CONTEXT();

    /* Call the handler to do the work.  This must be a separate function to
     * the wrapper to ensure the correct stack frame is set up. */
    __asm volatile ( "bl vButtonHandler" );

    /* Restore the context of whichever task is going to run once the interrupt
     * completes. */
    portRESTORE_CONTEXT();
}
